Which social science studies how populations develop in certain regions based on available resources?

Demography (from the Greek demos meaning “people” and grapho meaning “measurement” or “description”) is the statistical study of human populations. It can study any factor of any living population, and often uses measurements such as births, migrations and deaths as indicators of population changes. It can help us understand how societies develop and how they are impacted by changes in a region’s conditions.

It is often considered a subfield of sociology, which is the field that studies human societies in general.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !